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From "Pengcheng Xiong (JIRA)" <>
Subject [jira] [Commented] (HIVE-11775) Implement limit push down through union all in CBO
Date Sat, 19 Dec 2015 07:50:46 GMT


Pengcheng Xiong commented on HIVE-11775:

The failed tests are not related and they appeared in the other pre-commit runs. Pushed to
master and 2.0. Thanks [~jpullokkaran] for the review!

> Implement limit push down through union all in CBO
> --------------------------------------------------
>                 Key: HIVE-11775
>                 URL:
>             Project: Hive
>          Issue Type: New Feature
>            Reporter: Pengcheng Xiong
>            Assignee: Pengcheng Xiong
>         Attachments: HIVE-11775.01.patch, HIVE-11775.02.patch, HIVE-11775.03.patch, HIVE-11775.04.patch,
HIVE-11775.05.patch, HIVE-11775.06.patch, HIVE-11775.07.patch, HIVE-11775.08.patch, HIVE-11775.09.patch,
HIVE-11775.10.patch, HIVE-11775.11.patch, HIVE-11775.12.patch, HIVE-11775.13.patch
> Enlightened by HIVE-11684 (Kudos to [~jcamachorodriguez]), we can actually push limit
down through union all, which reduces the intermediate number of rows in union branches. 

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